How to show an alertDailogue in doInBackground(..) of an AsycncTask running..?

Question

Error: Getting error with UI thread.. when I'm trying to show an alert inside the doInBackground. Is there any posibility do this stuff?

private class LoggingTask extends AsyncTask<String, Void, Integer> {

    @Override
    protected Integer doInBackground(String... params) {
                 //Get the sever connection and return the status

    if(status==0){
             // show an alert here....
    }
        return status;
    }

Try Show dialog in onPostExecute() method. As doInBackground() run in Background tread, so you can't show dialog. — Amit Gupta, Nov 21 '13 at 06:57
Its not possible to show alert in background. http://stackoverflow.com/a/5990202/1476699 — vinay, Nov 21 '13 at 06:58
why in doInBackground method? You can show that alert dialog in `onPostExeute()` method right? — Abhishek V, Nov 21 '13 at 06:58
@Abishek..I know the issue that in doInBackground we dont have the UI interaction.. I'm asking is it possible? — Joyal, Nov 21 '13 at 07:08

score 1 · Accepted Answer · answered Nov 21 '13 at 07:04

@Override
protected Integer doInBackground(String... params) {
    // Get the sever connection and return the status

  publishProgress()
  @Override
  protected void onProgressUpdate(Void... values) {
  // TODO Auto-generated method stub
  super.onProgressUpdate(values);
 //Do what ever you want 
    }

score 0 · Answer 2 · answered Nov 21 '13 at 06:57

0

Do in background method doesnot allowed for UI changes,if you want to make any UI changes do in onpostexecute method

answered Nov 21 '13 at 06:57

Gajendran

13
6

score 0 · Answer 3 · answered Nov 21 '13 at 06:58

0

Do this way

@Override
    protected Integer doInBackground(String... params) {
        // Get the sever connection and return the status

        if (status == 0) {
            new Handler().post(new Runnable() {

                @Override
                public void run() {
                    // show an alert here....

                }
            });

        }
        return status;
    }

answered Nov 21 '13 at 06:58

Biraj Zalavadia

28,348
10
61
77

@biraj.. you right but if using Thread Handler ,the AsyncTask can be thrown out.. – Joyal Nov 21 '13 at 07:05
1

another solution is onPostExecute() given by @ Coderji – Biraj Zalavadia Nov 21 '13 at 07:07
Already I followed tat way.. problem is tat ,if this AsyncTask is in login functionality, status from server is Invalid Login, want to show alert from doInBack and exit the app.. your way is also good..Thank you – Joyal Nov 21 '13 at 07:17

score 0 · Answer 4 · answered Nov 21 '13 at 06:58

Make a method that creates the dialog in your activty ( context would be the activity ) not in the AsyncTask. So when your

if ( status == 0 )

returns true, you call the method from the UI thread. In this way you are not creating the dialog in the AsyncTask and it should work.

score 0 · Answer 5 · answered Nov 21 '13 at 07:00

0

doInBackground() is not the right place to do the UI related Task. You have to do it in onPostExecute. Or you can can start the dialog in OnPreExecute() and than cancel the dialog onPostExecute().

answered Nov 21 '13 at 07:00

Jatin Malwal

5,133
2
23
26

score 0 · Answer 6 · answered Nov 21 '13 at 07:01

0

Async tasks don't run on the ui thread that's why you can't do that. Store a boolean. Then call the alert dialog after the asynchronous task completes in the onpostexecute method.

answered Nov 21 '13 at 07:01

Dave Hulse

70
6

How to show an alertDailogue in doInBackground(..) of an AsycncTask running..?

6 Answers6

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